mass[Wallets] is for companies that already have (or are building) a customer relationship and want the wallet and the dollar-balance to live inside their own brand.
OTC desks
If you move size for clients today, a branded wallet lets those clients hold value with you between trades — with insurance and privacy features they do not get from a generic personal wallet.
dApps
If you run a protocol or application, a branded wallet is how you own distribution: keep users in your surface, and let a branded stablecoin carry the float and the rewards logic.
New stablecoin issuers
If your goal is a branded USD-pegged coin, mass[Wallets] attaches that coin to a wallet that already connects to DeFi and to fiat rails, so you can spend time on distribution instead of standing up custody, liquidity bootstrapping, and wallet UX.
If you are an individual looking for a personal crypto app, mass[Wallets] is not that product. Use the wallet brand you already signed up with, or see “I am an end-user of a branded wallet.”